led dispaly sign for bus *High density of integration; * ... Frequency:120±20Hz/SVisual range:2—20mVisual Angle: ±45°LED Brightness:2200±600cd/M²Brightness level:1-16 Adjustable ... DC9—24VMemory: 4M, 8M extendedAdvertisement Line:>2000(5000 extended)Display mode(10-40seconds):Immediatly,left,right,up,down……….Data security ... RS232/RS485/GSM/GPRSAlarm: SOS Alarm indoor yellow used LED display sign for bus